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发明名称
Rotary drill
摘要
申请公布号
US2634955(A)
申请公布日期
1953.04.14
申请号
US19500161941
申请日期
1950.05.15
申请人
JOHNSON JENERS S
发明人
JOHNSON JENERS S.
分类号
E21B10/08;E21B10/22
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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